Question

The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 119 and standard deviation of 26 . Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher. (a) Around what percentage of adults in the USA have stage 2 high blood pressure? Give your answer rounded to two decimal places. % (b) Stage 1 high BP is specified as systolic BP between 140 and 160. What percentage of adults in the US qualify for stage 1? Give your answer rounded to two decimal places. % (c). Your doctor tells you you are in the 30th percentile (e.g. bottom 30%) for blood pressure among US adults. What is your systolic BP? Give your answer rounded to two decimal places. lbs

Answer 1

a)

b)

c)

P(Z<z)=0.3

from normal distribution table

P(Z<-0.5244)=0.3

X=Z*(std dev)+mean

X=-0.5244*26+119= 105.3656 ----ans

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